JPH0340276B2 - - Google Patents

Description

Detailed Description of the Invention "Objective of the Invention" (Industrial Application Field) The present invention is directed to absorbing the water hammer phenomenon that occurs in water or hot water supply pipes, etc. This invention relates to a new pressure reliever that protects the equipment and the supply pipe itself.

(Prior Art) FIG. 2 is a side sectional view showing a conventional pressure reliever 3. The pressure reliever 3 is installed in the path of a water or hot water supply pipe (hereinafter, the water supply pipe 1 will be explained as an example), and is composed of a spherical case 4 and a cheese 2. It was on. Inside the spherical case 4,
A diaphragm 4c was provided to divide the inside of the case into a pressurizing chamber 4a and a compression chamber 4b. Generally, the compression chamber 4b was filled with nitrogen gas, and its internal pressure was maintained at around 4 kg/cm ² .
Further, the pressurizing chamber 4a was connected to the water supply pipe 1 via the cheese 2. Therefore, for example, by suddenly turning off a faucet device (not shown) connected to the water supply pipe 1, the water supply pipe 1 can be closed.
When a shock wave with an abnormally high pressure inside is propagated, water that has flowed into the pressurizing chamber 4a of the pressure reliever 3 from the beginning causes the diaphragm 4c to curve toward the compression chamber 4b. Therefore, no reflected wave was generated in response to the shock wave, and the water hammer phenomenon was eliminated.

(Problems to be Solved by the Invention) The diaphragm 4c of the pressure reliever 3 is made of nitrile rubber or the like, and the compression chamber 4b
It also served as a gas seal to prevent gas leaks. However, it was impossible to achieve a complete seal, and nitrile rubber itself permeated a small amount of nitrogen gas, so it took approximately 6 months to 1
After a relatively short period of about 20 years, it became impossible to obtain sufficient function as a pressure reliever. Therefore, it is necessary to replenish gas or replace the pressure reliever 3 itself each time, resulting in an increase in running costs. Furthermore, since the pressure reliever 3 is usually installed in a deep place in a building, inside a wall of a building, or in a pipe section such as in a storage compartment under a washbasin or kitchen table, the gas replenishment work as described above is not possible. , replacement work, etc. was extremely troublesome.

The present invention has been made in view of the above circumstances, and is a novel method for water hammers that does not require replenishment of nitrogen gas or replacement of the pressure reliever itself, and can reduce running costs. The purpose is to provide a pressure reliever (hereinafter referred to as the present reliever).

"Structure of the Invention" (Means for Solving the Problems) The gist of the present mitigation device is that it includes a cylinder body that includes a large-diameter water chamber and a small-diameter air chamber that communicate with each other; A sliding valve body is provided with a flange that comes into close contact with the water passage chamber of the cylinder body at one end of the cylinder that comes into close contact with the air chamber of the cylinder body; A check valve for intake provided at a place to seal the air, a secondary supply pipe for water or hot water connected to the end of the pipe near the water passage chamber of the cylinder body, and a pipe wall of the cylinder body. It consists of a primary supply pipe of water or hot water that is connected to an appropriate location in a portion corresponding to the water flow chamber, and the sliding valve body is formed in the shape of a cap with the cylinder body closer to the air chamber closed and the side closer to the water flow chamber open. In addition, a water passage hole is provided on the circumferential surface near the flange.

(Function) When water flows from the primary supply pipe to the secondary supply pipe, the cylinder body is in a state in which almost the entire sliding valve body is accommodated in the water passage chamber (the most exit of the water passage chamber). (a state in which the flange of the sliding valve body approaches the portion where it is connected to the secondary side supply pipe). This is because the sliding valve body itself is attracted by the water pressure flowing toward the secondary supply pipe, or the flange of the sliding valve body is pressed against the flowing water. This state is the standby state for the shock wave of the present mitigation device. Note that when the sliding valve body slides in the above position, air is sucked through the check valve in the air chamber of the cylinder body.

Suppose now that the water flow in the supply pipe is abruptly stopped, and a shock wave is propagated from the secondary supply pipe to the primary supply pipe due to a sudden increase in pressure. When the shock wave reaches the cylinder body of the present relaxation device from the secondary side supply pipe, it passes through the open end (flange side) of the sliding valve body in the water flow chamber to the closed end surface inside the cylinder body. A shock wave will hit you. Therefore, the sliding valve body slides toward the air chamber of the cylinder body. At this time, the air chamber of the cylinder body is filled with air as described above. Since this filled air is not released from the air chamber to the atmosphere, it is compressed by the sliding of the sliding valve body. This air compression action absorbs the shock wave. Further, when the sliding valve body is positioned within the air chamber of the cylinder body, the inside of the cylinder of the sliding valve body substantially expands the volume of the water passage chamber of the cylinder body. Therefore, this also absorbs the shock wave. In this way, no reflected wave is generated in response to the shock wave, and the water hammer phenomenon is prevented from occurring.

(Examples) Hereinafter, the present invention will be explained based on the drawings shown in the examples.

FIG. 1 is a side sectional view showing the present relaxation device.
This relaxation device consists of a primary supply pipe 5 and a secondary supply pipe 6.
are arranged orthogonally, and the main cylinder body 7 is interposed between them. Further, the cylinder body 7 is provided with a check valve 8 on its upper side, and a sliding valve body 9 is housed inside the check valve 8. In other words, the primary supply pipe 5 is an upstream piping section such as a water pipe, and the secondary supply pipe 6 is a downstream piping section connected to a water faucet (not shown).

Inside the cylinder body 7, a large-diameter water passage chamber 7a is formed in its lower half, and a small-diameter air chamber 7b is formed in its upper half. The water chamber 7a and the air chamber 7b communicate with each other. In the cylinder body 7, the connection part with the primary side supply pipe 5 is a part corresponding to the water flow chamber 7a in the pipe wall part. In this embodiment, a joint portion 10 is formed at the upper end of the water passage chamber 7a immediately before communicating with the air chamber 7b. On the other hand, in the cylinder body 7, the connection part with the secondary supply pipe 6 is the pipe wall part on the side where the water flow chamber 7a is provided, that is, the lower end part. Therefore, water flows inside the cylinder body 7 as shown by the white arrows A and B.

The sliding valve body 9 is integrally formed with a cylindrical body 11 whose upper end is closed and whose lower end is open, and a flange 12 provided around the outer periphery of the cylindrical body 11 near the open end. , the overall shape is cap-shaped.
The cylindrical body 11 is formed so as to be in close contact with the inner circumferential surface of the air chamber 7b of the cylinder body 7, and a U-shaped annular packing 13 is fitted therein to maintain watertightness during sliding contact. There is. In addition, the flange 12
is formed so as to be in close contact with the inner peripheral surface of the water passage chamber 7a of the cylinder body 7. and,
Water passage holes 14 communicating with the water passage chamber 7a of the cylinder body 7 are equally spaced on the circumferential surface of the cylinder near the flange 12.

The check valve 8 is provided at the upper pipe end of the cylinder body 7 to seal the air chamber 7b of the cylinder body 7 with the sliding valve body 9. The check valve 8 is connected to the air chamber 7b of the cylinder body 7.
The air chamber 7b is arranged in such a direction that air can be taken in, but air cannot be released to the atmosphere from the air chamber 7b.

By the way, at the upper end closed portion of the sliding valve body 9,
It is assumed that the inner surface 11a of the cylinder is larger in area than the upper annular surface 12a of the flange 12. In this case, when water is not flowing through each of the supply pipes 5 and 6, the sliding valve body 9 waits in the raised position (indicated by the two-dot chain line) in the water flow chamber 7a of the cylinder body 7. Become. This is due to the difference in pressure receiving area with respect to the static pressure of water. However, each supply pipe 5,6
When water flows inside, the sliding valve body 9 is sucked downward and slides, and comes to standby at the lowered position. on the other hand,
In the upper end closed portion of the sliding valve body 9, the inner surface 11a of the cylinder is smaller in area than the upper annular surface 12a of the collar portion 12, or the surface 1 of the sliding valve body 9 is
It is assumed that the load on the sliding valve body 9 is greater than the static pressure (push-up force) of water acting on 1a. In this case, the sliding valve body 9 comes to stand by at the lowered position from the beginning, regardless of whether water is in the flowing state or not in the supply pipes 5 and 6. In this way, the sliding valve body 9
is accommodated in the water flow chamber 7a of the cylinder body 7 (closest to the outlet of the water flow chamber 7a (secondary side supply pipe 6)
The state in which the flange 12 of the sliding valve body 9 approaches the connecting portion) is the standby state for shock waves of the present mitigator. Note that when the sliding valve body 9 assumes the above position, the air chamber 7b of the cylinder body 7 is filled with air via the check valve 8.

Now, by abruptly turning off the faucet equipment (not shown) connected to the downstream part of the secondary supply pipe 6, a sudden leak is caused from the secondary supply pipe 6 to the primary supply pipe 5. Suppose that a shock wave due to pressure increase is propagated. After reaching the cylinder body 7, the shock wave propagates inside the cylindrical body 11 of the sliding valve body 9, and hits the inner surface 11a of the upper end closed portion thereof. Therefore, the sliding valve body 9 is connected to the air chamber 7b of the cylinder body 7.
As a result, the air is compressed in the air chamber 7b of the cylinder body 7. This air compression action absorbs the shock wave.
Further, when the sliding valve body 9 is accommodated in the air chamber 7b of the cylinder body 7, the inside of the cylinder of the sliding valve body 9 substantially enlarges the water passage chamber 7a of the cylinder body 7. . Therefore, this also absorbs the shock wave. Therefore, no reflected wave is generated in response to the shock wave, and the water hammer phenomenon is prevented from occurring. Note that when the sliding valve body 9 slides upward, some of the air that had been filled in the air chamber 7b of the cylinder body 7 is pushed out toward the water passage chamber 7a, but the sliding valve body 9 When the cylinder body 7 returns to the standby state for the next shock wave, the cylinder body 7
The air chamber 7b is filled with air.

(Consideration of Alternative Aspects) The placement location of the present mitigation device is not limited in any way. For example, it may be integrated into a faucet device (such as a discharge pipe), an instantaneous water heater, a water heater, or the like. In this way, the configuration and shape of the present moderator can be changed as appropriate depending on the mode of implementation.

"Effects of the Invention" As is clear from the above explanation, the pressure reliever for a water hammer according to the present invention does not have a structure that seals in a specific amount of nitrogen gas, but has a structure that allows air to be replenished each time. Because it is long, there is no need to worry about gas leaks, and there is no need to replenish gas or replace the pressure reliever itself. In other words, the present alleviator can be used semi-permanently. Furthermore, since gas replenishment work and gas replacement work are not required, running costs can also be completely eliminated. By the way, conventional pressure relievers create a place for water to escape due to shock waves by compressing nitrogen gas in a compression chamber. Therefore, the area of the part (diaphragm) that receives the shock wave needs to be large, and a sufficient compression volume of the nitrogen gas in the compression chamber must be ensured. Therefore, it was quite large. On the other hand, in the present moderator, the volume of the water passage chamber of the cylinder body is expanded by the sliding of the sliding valve body, thereby forming an escape area for water caused by shock waves. Therefore, there is no need to make the water passage chamber of the cylinder body larger than originally, and miniaturization is possible. Therefore, even if there is a supply pipe in which multiple faucet appliances are branched and connected, there is no need to attach the present mitigation device to each faucet appliance, and only one can be attached to the main pipe before branching. Can be done. In other words, when the present relaxation device is attached to an individual faucet appliance, it has many excellent advantages, such as the fact that an extremely small device is sufficient.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the present pressure reliever, and FIG. 2 is a side sectional view showing a conventional pressure reliever. 5...Primary side supply pipe, 6...Secondary side supply pipe, 7
... Cylinder body, 7a ... Water flow chamber, 7b ... Air chamber, 8 ... Check valve, 9 ... Sliding valve body, 11 ...
Cylindrical body, 12... collar part.

Claims (1)

[Claims] 1. A cylinder body with a large diameter water passage chamber and a small diameter air chamber that communicate with each other inside, and water passage of the cylinder body to one end of the cylindrical body that is in close contact with the circumferential surface of the air chamber of the cylinder body. A sliding valve body with a flange that comes into close contact with the inner circumferential surface, an intake check valve installed at a location that seals the air chamber against the cylinder body, and a pipe adjacent to the water flow chamber of the cylinder body. It consists of a secondary supply pipe for water or hot water connected to the end part, and a primary supply pipe for water or hot water connected to a suitable place in the pipe wall part of the cylinder body corresponding to the water flow chamber, and The sliding valve body is formed into a cap shape in which the air chamber side of the cylinder body is closed and the water passage chamber side is open, and a water passage hole is bored in the circumferential surface near the flange. Features a pressure reliever for water hammers.